The term 'Grasshopper Sound' is used to describe the sound made by grasshoppers, which is a combination of four distinct sounds: churr (5 letters), chirr (5 letters), TRILL (5 letters), and birt (4 letters). Churr is a low-pitched sound, chirr is a high-pitched sound, TRILL is a rapid series of notes, and birt is a short, sharp sound. Together, these four sounds create the unique sound of a grasshopper.